How can handle height of 2 ＜div＞ be same with other when they are side by side, in situation...

CSS: How can handle height of 2 ＜div＞ be same with other when they are side by side, in situation that content of page will change after load page Helpful? Please use the *Thanks* button above! Or, thank me via Patreon: https://www.patreon.com/roelvandepaar! With thanks & praise to God, and with thanks to the many people who have made this project possible! | Content (except music & images) licensed under CC BY-SA https://meta.stackexchange.com/help/licensing | Music: https://www.bensound.com/licensing | Images: https://stocksnap.io/license & others | With thanks to user M.i.T (stackoverflow.com/users/3237177), user chrona (stackoverflow.com/users/2219120), and the Stack Exchange Network (stackoverflow.com/questions/33760600). Trademarks are property of their respective owners. Disclaimer: All information is provided "AS IS" without warranty of any kind. You are responsible for your own actions. Please contact me if anything is amiss at Roel D.OT VandePaar A.T gmail.com